New Lancet Report Links 710,000 Global Deaths in 2023 to Heat, Highlighting Broader Health Impacts Beyond Heatstroke

A new report from The Lancet, published on October 31, 2026, estimates approximately 710,000 heat-related deaths worldwide in 2023, marking the highest value in the analyzed series. The report emphasizes that heat-related mortality extends beyond heatstroke, encompassing deaths resulting from high temperatures exacerbating pre-existing conditions such as cardiovascular diseases, respiratory issues, and diabetes, as well as causing acute kidney damage. The analysis suggests that 71.5% of these deaths are attributable to human-caused climate change. The World Health Organization (WHO) also highlights the strain high temperatures place on the heart and kidneys as the body attempts to cool itself.